Black color is “Neutral” while red is “Phase or Line” and the yellow/green wire is used for ground / earth. The water heater element is connected to the thermostat via T 2 as hot and L 4 as neutral. the Line is connected to the L 1 terminal while neutral or second line is connected to the L 3 terminal. ![]() The wiring connections for both single phase 120V and 240V are the same i.e. In the following water heater wiring diagram, a 3000 Watts single heating element is shown connected to 120V AC as well as 240V AC. The same thermostat can be wired for both 120V AC (Line and Neutral) and 240V AC (two lines or phase wires). So the nearest 30A breaker can be used.Ģ40V & 120V AC Single Phase Single Element Thermostat Wiring Connection In other words, the circuit breaker should be rated about 125% of full load current i.e. The safe maximum current of the circuit breaker is 80% i.e. This way, a 30A circuit breaker and 8 gauge wire for both line and neutral is suitable according to the rating. Since the supply voltage is 120V, hence it draws the maximum of 25 amperes current (Ohm’s law: I = P/V). The rating of the water heater element is 3kW. The earth or ground “G” is connected to the junction box of the water heater. On the other hand, the neutral (N) is directly connected to the second terminal of the heating element. In this wiring connection, the phase line (L) from 120V/240V main panel (SP breaker) is connected to the L 1 screw on the thermostat and then leaving the T 2 terminal which is further connected to the single heating element. 120V AC Single Phase Single Element Water Heater Thermostat Wiring Let’s see different wiring diagrams for single element water heater thermostats as follows.
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